Sharpening device



Mar. 27, 1923- B. FINE ET AL SHARPENING DEVICE 2 sheetsI-sheet 1 Filed May 25, 1922 B. FINE ET AL.

SHARPENING DEVICE Filed May 25, 1922' 2 sheets-sheet Patented Mar- 27, 1923,

UNITED STATES PATENT orrlcs.

SHARIENING DEVICE.

Application filed May 25, 1922. Serial No. 563,720.

To all whom it may concern:

Be it known that we, BENJAMIN FINE and DANIEL FINE, both citizens of the United States, and residents of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Sharpening Devices, of which the following is a specification.

Our invention relates to an improved sim ple machine which'may be employed for sharpening chalk and other marking crayons or materials for various uses but which is more particularly adaptable for sharpening the fiat and broad pieces of chalk or composition used by tailors and cutters of clothing. The object of the invent-ion is to produce a simple -machine into which the chalk or composition marking material may beset on edge between opposed knife or scraper structures which are reciprocated in opposite direction by simple crank mechanism to support the chalk and to out or scrape it to a fine marking edge. Another important object of the invention is toprovide simple means whereby chalk pencils or crayons may also be sharpened at the same time that themachine' is sharpening fiat chalk or composition.

The various features of our invention are clearly disclosed on the machineshown on the accompanying drawing, in which draw- 1ng Fig. 1 is a plan view of the machine with the top removed,

Fig. 2 is a sectional view on plane 22, Fi 1,

Fig. 3 is a view from plane 33, Fig. l, FFig. 4 is a sectional view on plane 44,

Fig. 5 is a sectional view of the pencil sharpener head showing a pencil therein,

Fig. 6 is a sideelevational view of a section of one of the knife or scraper structures showing a modified arrangement, and F Fig. 7 is a sectional view on plane 77,

The machine comprises the supporting and protecting housing 10having the cover 11. Extending between and secured to the transverse end walls of thehousing are the guide bars 12 and 13. These guide bars are parallel and are spaced apart and support respectively the carrier frames'14 and 15 from which extend respectively the cutting or scraping blades 16 and'17. Outside of one of the end walls a crank shaft 18 is journaled in the bearings 19 and 20 secured to the housing, the shaft at one end having the crank handle 21 provided with the knob 22. Between the bars 12 and 13 the end Wall has the opening 23 and at said opening the crank shaft has the crank deflections 24 and 25 spaced 180 degrees apart. The crank deflection 24 is engaged by the connecting rod 26 which extends through opening 23 and is pivoted to the carrier frame 14 by means of the screw 27. The crank deflection 25 is connected to the connecting rod 28 which at its inner end ispivoted to the carrier frame 15 by the screw 29. With this arrangement, when the crank shaft is turned the carrier frame will be reciprocated on the bars 12 and 13. On account of the displacement of thecrank deflections the carrier frames will always travel in opposite directions.

On Figs. 1, 2 and 4 the-knives or scrapers are shown of L shape detachably fastenedto the respective carrier frames by screws 30, the cutting edges being spaced apart to permit insertion between them of the chalk or marking composition O, and the edges being on the bias to give the desired-angle to the chalk, as clearly shown in Fig. 2.

Between the longitudinal sides of the housing extends the floor3l which at its sides supports the spaced apart ears 32 and 33 respectively which support the hinge pins 34 and 35 for the L shape clamping arms 86 and 37. The upper ends of these arms extend horizontally toward each other above the knives and have the slots 38 and 39 respectively in their-ends for receiving the ends of the chalk or composition tablets C. Springs 40 and 41 are connected with the arms and tend to pull them toward each other to yieldingly clamp the chalk. To, form. a support for the chalk after it has been sufficiently sharpened we provide a plate 42, and to make this plate yielding We connect the inner-ends of the springs 40 and 41 thereto as clearly shown in Fig. 4. The- '37 to swing it suificiently so thatthe other end of the chalk can be inserted in the slot of the other arm. Normally, when there is no chalk between the arms their. inward movement is limited by their engagement against the floor 31. WVhen a chalk piece has been inserted between the arms and the blades the crank shaft is turned and the weight of the chalk piece itself or light pressure thereon by the finger will cause it to be fed downwardly so that the kniveswill shave it down to the desired edge. As the carrier frames 14 and 15 travel in opposite directions the blades will hold the chalk piece longitudinally centered, and as soon as enough of the chalk piece has been cut away to permit its lower edge to engage with the plate 42 there will be no further cutting. If more cutting is desired sufiicient pressure can be applied on the chalk piece to cause the plate 42 to be depressed. On the floor 81 below the knives a drawer 4 1 is provided to catch the cuttings and shavings.

The blades can extend at right angles to the path of travel of the carriers, or at an angle as shown in Fig. 1. Instead of having the knives separate structures secured to the carrier frames as shown in Fig. 1 these knives could be made integraL with the frames by making the frames of sheet metal and punching the blades 16' from the inner walls thereof as illustrated in Figs. 6 and 7.

On the rear end of the crank shaft 18 we provide a cutter head 45 between which and the entrance plate 46 extend the blades 47. The plate 46 has the opening 48 through which a crayon or chalk pencil I may be inserted between the edges of the blades to be sharpened when the crank is turned. By turning the crank it is thus possible to sharpen crayons while a piece of chalk C is being sharpened.

We thus produce a very simple and efficient device by means of which tailors chalk or marking composition pieces can be quickly and accurately sharpened and which can be used at the same time for sharpening chalk pencils or crayon. We do not desire to be limited to the exact construction and arrangement shown as changes and modifications can be made which will still come within the scope of the invention.

We claim as follows:

1. In a sharpening machine of the class described, the combination of oppositely disposed carriers, blades extending from said carriers toward each other but to leave a gap for the insertion of a slab of tailors chalk or marking material, and means for reciprocating said carriers in opposite directions.

2. In a sharpening device of the class described, the combination of carriers mounted to reciprocate, blades extending from said carriers toward each other but leaving a space between them for the insertion of a slab of marking material to be sharpened, a crank shaft, and connections between said crank shaft and carriers for causing simultaneous reciprocation thereof in opposite directions.

3. In a sharpening device of the class described, the combination of a housing, guide bars supported on said housing, carriers slidable on said bars, blades extending from said carriers toward each other, means for supporting a slab or chalk or marking material between said blades, a crank shaft journaled on said housing, and crank connections between said crank shaft and said carriers for causing simultaenous reciprocation of said carriers but in opposite directions.

4;. In a sharpening machine of the class described, the combination of a supporting structure, guide bars thereon, carriers on said guide bars, blades extending from said carriers toward each other, means for supporting a slab of marking material between the blade edges, clamps for yieldingly holding said slab against longitudinal displacement, and means for simultaneously reciprocating said carriers in opposite directions.

5. In a sharpening machine of the class described, the combination of a supporting housing, guide bars on said housing, carriers slidable on said guide bars, blades extending from said carriers toward each other, means for supporting a slab of marking material between said blades, means for reciprocating said carriers simultaneously and in opposite directions to cause the slab to be shaved, and spring actuated arms engaging with the ends of said slab to hold it against longitudinal displacement during sharpening thereof.

6. In a sharpening device of the class described, the combination of a supporting housing, guide bars on said housing, carriers slidable on said guide bars, blades extending from said carriers towards each other, a yiel-dable floor below said blades for supporting a slab of marking material to be sharpened, a crank shaft, crank connections between said shaft and said carriers for causing reciprocation thereof in opposite directions, and spring actuated arms engaging against the ends of said slab for holding it against longitudinal displacement.

7. In a sharpening machine of the class described, the combination of supporting framework, guide bars on said framework extending opposite each other and parallel, carriers slidable on said bars, sharpening blades extending from said carriers toward each other but leaving a passageway for the insertion of a slab of ma terial to be sharpened, means for causing reciprocation of said carriers simultaneously but in opposite directions, arms hinged at their lower ends and engagin at their upper ends against the ends of t e slab to hold it against longitudinal displacement, a stop plate below said blades for the slab, and springs connecting between the ends of said plate and said arms, said springs serving to yieldingly hold said plate in position to support the slab and also serving to yieldingly press said arms against the ends of the slab.

8. In a sharpening machine of the class described, the combination of supporting framework, guide bars extending across said framework, carriers slidable on said bars, blades extending from said carriers towards each other, the edges of said blades extending diagonally whereby a V shape slot is formed between the blade edges for the reception of a slab of marking material to be sharpened, yieldable arms engaging with the ends of a slab to hold it against longitudinal displacement, and means for reciprocating said carriers simultaneously and in opposite directions to cause sharpening of a slab between them.. I

9. In a sharpening machine of the class described, the combination of opposed guide bars, knife structures slidab'le on said bars, blades extendingfrom said' structures toward each other but leaving a space for the insertion between them of a slab of material to be sharpened, a floor below said blades for receiving the slab after sharpening thereof, means for reciprocating said knife structures simultaneously but in opposite directions, arms hinged at their lower end and extending inward at their upper ends to engage against the ends of a slab to hold it against longitudinal displacement, and springs yieldingly holding said arms against the slab.

In witness whereof, we hereunto subscribe our names this 23rd day of May, A. D.,

BENJAMIN FINE. DANIEL FINE. 

